Slobodan Cuk

6388896, May 14, 2002

Mar 22, 2001

09/816423

Slobodan Cuk - Laguna Hills CA, 92653

H02M 3335

363 16

A new switching converter operates at record high efficiency despite its small size and light weight and enables ultra high overload current capability owing to two novel methods: new Lossless Switching method eliminates switching losses by use of a precise sequence and timing of the four controllable switches, while novel DC Transformer structure provides a method to eliminate the stored DC energy in magnetics, which further increases efficiency and reduces the magnetics and converter size.

6400579, Jun 4, 2002

Mar 24, 2000

09/535004

Slobodan Cuk - Laguna Hills CA, 92653

H02M 3335

363 16, 363 97, 323266

Soft switching DC-to-DC converter operates at record high efficiency despite its small size and weight and ultra high overload current capability of several times the nominal load current. Such performance is made possible by use of unique magnetic and switching circuits with special properties. Other desirable performance features are provided concurrently such as: zero ripple current on input and output, low conducted and radiated Electromagnetic interference (EMI) noise, as well as low component stresses for increased converter reliability.

6462962, Oct 8, 2002

Sep 8, 2000

09/658676

Slobodan Cuk - Laguna Hills CA, 92653

H02M 3335

363 16, 363131, 363 41, 363 55

A new lossless switching DC-to-DC converter with novel lossless switching time control for up to four controllable switches, with each switch meeting the specific current-voltage switching characteristics, operates at ultra high efficiency in a very compact size and offers additional performance advantages, such as low EMI noise, low switching ripple currents, and improved reliability.

7778046, Aug 17, 2010

Dec 17, 2008

12/317009

Slobodan Cuk - Irvine CA, US
Zhe Zhang - Rancho Santa Margarita CA, US

H02M 3/335

363 16, 323222, 323284

A non-isolated and isolated both polarity non-inverting and polarity inverting switching DC-to-DC converters with three switches are provided with a basic voltage step-up DC gain characteristics and a very efficient operation without a danger of voltage overstress of any of the three switches over the full operating range from duty ratio of 0 to 1. 0, thus resulting in wide input voltage operating range. The isolated extensions feature transformer with no DC-bias for efficient operation and small size. Full-bridge secondary side implementation further reduces the output filtering requirements.

7915874, Mar 29, 2011

Oct 4, 2010

12/924743

Slobodan Cuk - Laguna Niguel CA, US

Cuks, LLC - Irvine CA

G05F 1/613
G05F 1/00

323224, 323233, 323293, 323290, 323259

Unlike buck converter and tapped-inductor buck converters, which use only inductive energy transfer, the present invention employs the capacitive energy transfer in addition to inductive energy transfer. The hybrid transformer performs the double duty simultaneously: transfers the input inductive energy storage to the load through a taped-inductor turns ratio n but also transfers the resonant capacitor discharge current to the load during OFF-time interval amplified by turns ratio m of the hybrid transformer. Despite the presence of the resonant inductor current during the OFF-time interval, the output voltage is neither dependent on resonant component values nor on the load current as in conventional resonant converters but depends on duty ratio D and turns ratio n of the hybrid transformer. Hence a simple regulation of output voltage is achieved using duty ratio control.

8040704, Oct 18, 2011

Jun 27, 2008

12/215536

Slobodan Cuk - Laguna Niguel CA, US

Cuks, LLC - Irvine CA

H02M 3/24
H02H 7/122
H02M 3/335

363 95, 363 17, 363 5602

Switching Converter with a novel two-loop Integrated magnetic structure integrates transformer and two output inductors and eliminates large circulating current in the transformer secondary side resulting in ultra high efficiency and zero ripple output current as well as zero ripple currents in both output inductors simultaneously. The novel lossless switching method eliminates the primary side switching losses to result in switching converter with highest efficiency, compact size and additional performance advantages, such as ultra low output ripple voltage, low EMI noise and improved reliability with additional benefits when operated with a front-end Power Factor Converter for computer server applications.

8134351, Mar 13, 2012

Jun 30, 2010

12/803670

Slobodan Cuk - Laguna Niguel CA, US

Cuks, LLC - Irvine CA

G05F 1/59
G05F 1/595

323271, 323282

A four-switch step-down storageless DC-DC converter is provided having simultaneously ultra high efficiency of over 99% in an ultra compact size, while also providing a regulation and maintaining fast transient response while in regulation. Because of its storageless feature it is ideal for demanding computer applications, such as VRM (Voltage Regulator Modules), with extremely fast step-load load current change requirements and tight output voltage regulation requiring ultra low output ripple voltages during the transients.

8350538, Jan 8, 2013

Apr 10, 2010

12/798687

Slobodan Cuk - Laguna Niguel CA, US

Cuks, LLC - Irvine CA

G05F 1/656

323222, 323224, 363 17

A number of non-isolated and isolated converter embodiments are disclosed all featuring the three switches and characteristic not present in prior-art converters such as: a) reduced voltage stresses on all three switches resulting in safe operation without a danger of voltage overstress of any of the three switches over the full operating range from duty ratio of 0 to 1. 0 and thus resulting in wide input voltage operating. b) operating range with magnetics flux and magnetic size much reduced compared to prior-art converters c) stressless switching eliminates switching losses and reduces stresses which are present in prior-art converters. All three features result in simultaneous increase of efficiency, reduction of size and cost when compared with prior-art converters.